ATSAM3N0BA-MUR - 32-bit ARM Cortex-M3 MCU 48MHz 32KB | Microchip
MPN: ATSAM3N0BA-MUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.45 | $34.50 |
| 100 | $3.05 | $305.00 |
| 500 | $2.7 | $1,350.00 |
| 1,000 | $2.4 | $2,400.00 |
ATSAM3N0BA-MUR Overview
A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals, serving as the computational heart of embedded systems. Within the product hierarchy, the ARM Cortex-M3 core places the SAM3N in the 32-bit embedded microcontroller family, sitting above 8-bit MCUs in performance while consuming less power than higher-performance Cortex-M4 parts. The SAM3N family targets cost-sensitive, high-volume applications where integration and price dominate selection.
Key features of the ATSAM3N0BA include a single-core Cortex-M3 RISC processor running at 48 MHz, 32KB of embedded FLASH, 8KB of SRAM, and connectivity peripherals including I2C (TWI), SPI, UART/USART, and IrDA. The device operates from a 1.8V to 3.3V supply and is rated for industrial temperature environments, per the Mouser listing (QFN, GREEN, IND TEMP, MRL A).
Architecturally, the Cortex-M3 core features a 3-stage pipeline, Harvard bus structure, and a nested vectored interrupt controller (NVIC), enabling deterministic low-latency interrupt handling. The SAM3N0B integrates a power management controller with multiple sleep and wait modes, allowing designers to trade throughput for microamp-level standby current in battery-powered designs.
Typical applications include industrial sensors and control nodes, consumer appliance interfaces, and building automation or metering front-ends. The rich UART/SPI/I2C connectivity and low pin count cost profile make it a strong fit for communication bridges and peripheral controllers.
A key design consideration: the datasheet is published by Microchip (2018 revision referenced by FindIC), and the SAM3N series is pin-to-pin compatible with the SAM3S series, giving upgrade paths to parts with more FLASH and USB if requirements grow.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAM3N0BA-MUR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAM3N0BA-MUR (same form factor and footprint) — differing in Packaging, Core Size, Maximum Clock Frequency, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM3N0BA-MU
✅ Drop-In✓ In Stock
$0.98 / Unit
View Datasheet →ATSAM3N0AA-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2 / Unit
View Datasheet →ATSAM3N1BA-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAM3N2BA-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAM3N4BA-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAM3S4BA-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
Contact for price
View Datasheet →ATSAM3N0BA-MUR Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M3 |
| Core Size | 32-Bit Single-Core |
| Maximum Clock Frequency | 48 MHz |
| FLASH Program Memory | 32KB (32K x 8) |
| SRAM | 8KB |
| Supply Voltage | 1.8V / 3.3V (1.8V to 3.3V range) |
| Connectivity Peripherals | I2C, IrDA, SPI, UART/USART |
| Package | 64-QFN (9x9 mm) |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial |
| Packaging | Tape & Reel (T/R) |
| Green Status | GREEN (RoHS per Mouser GREEN indicator) |
ATSAM3N0BA-MUR 64-qfn (9x9 mm) Pin Configuration Guide
Pin configuration for ATSAM3N0BA-MUR (64-qfn (9x9 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATSAM3N0BA-MUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM3N0BA-MUR is suitable for 6 applications: Industrial Sensor Nodes, Communication Bridges and Converters, Consumer Appliance Control, Building Automation and Metering Front-Ends, Portable and Battery-Powered Devices, Embedded Peripheral Controllers.
Industrial Sensor Nodes
The ATSAM3N0BA-MUR fits industrial sensor nodes where a 32-bit Cortex-M3 at 48 MHz processes sensor data locally while UART, SPI, and TWI/I2C interfaces connect to ADCs, transceivers, or field buses. Its 1.8V-3.3V supply range supports standard industrial 3.3V rails, and the SAM3N power management controller with sleep/wait modes keeps average current low between sampling events. The 64-QFN package provides enough GPIO for multiple sensor channels, and the industrial temperature grade matches factory-floor environments. Firmware for signal filtering and threshold detection fits comfortably in 32KB FLASH, making this a cost-optimized choice for high-volume deployments.
Recommended
Communication Bridges and Converters
UART-to-SPI, RS-485-to-I2C, and protocol-converter designs benefit from the ATSAM3N0BA-MUR's combination of UART/USART, SPI, and TWI/I2C peripherals plus IrDA support. The Cortex-M3 core handles byte-level protocol translation with predictable latency via its NVIC interrupt controller, while DMA-capable peripherals offload data movement. The 48 MHz clock gives ample headroom above typical bridge line rates, and 8KB SRAM buffers multi-frame transactions. In a 64-QFN industrial-grade package on Tape & Reel, the part supports automated assembly for building automation bridges and gateways produced in volume.
Recommended
Consumer Appliance Control
Cost-sensitive appliance control boards - coffee makers, fans, small HVAC interfaces - use the ATSAM3N0BA-MUR to combine touch-button scanning, display driving via SPI, and sensor polling in one 32-bit MCU. The GREEN/RoHS-style packaging aligns with consumer regulatory requirements, and the 64-QFN (9x9 mm) footprint suits single-sided cost-optimized PCBs. The 1.8V-3.3V operation pairs directly with coin-cell or mains-derived 3.3V supplies. Aggressive SAM3N pricing targets high-volume production, and pin compatibility across SAM3N memory variants lets manufacturers cost-down FLASH size after firmware freeze without board respins.
Recommended
Building Automation and Metering Front-Ends
Smart metering and building automation front-ends require reliable serial links (UART/USART for meters, TWI/I2C for peripherals, SPI for displays) and long service life - the ATSAM3N0BA-MUR provides all of these in an industrial temperature grade. Low-power modes extend battery backup or energy-harvesting budgets between wake events, and the Cortex-M3's 32-bit arithmetic supports CRC, energy summation, and tamper detection routines in firmware. The 64-pin QFN supplies sufficient GPIO for relay controls and LED indicators, while 32KB FLASH accommodates communication stacks for Modbus-style protocols at production-friendly cost.
Recommended
Portable and Battery-Powered Devices
Handheld instruments and portable devices exploit the SAM3N0BA's power management architecture: the Cortex-M3 executes bursts at 48 MHz then drops to low-power sleep, conserving battery capacity. The 1.8V minimum supply allows operation from two-series-cell or single-Li-cell rails through simple regulation. Peripherals including UART, SPI, and IrDA cover legacy IR links common in handheld test gadgets and remote controls. The 9x9 mm 64-QFN keeps board area compact for enclosure-constrained products, and 8KB SRAM handles user-interface state machines plus modest data logging between uploads over UART or USB-bridge dongles.
Recommended
Embedded Peripheral Controllers
The ATSAM3N0BA-MUR serves as a housekeeping controller in larger systems - managing fan control, front-panel UI, power sequencing, and chassis monitoring via SPI-connected sensors and UART links to host processors. The 32-bit core handles concurrent timed tasks with hardware timers, while interrupt-driven serial links keep host communication responsive. Industrial temperature rating suits telecom and server chassis environments, and the GREEN Tape & Reel packaging supports contract manufacturing. Its pin compatibility with larger SAM3N/SAM3S variants provides a documented escape hatch if the controller's role expands to include USB or higher-layer stacks.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM3N0BA-MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM3N0BA-MU | ATSAM3N1BA-MUR | ATSAM3N4BA-MUR | ATSAM3S4BA-MUR |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Max Clock | ARM Cortex-M3, 48 MHz | ARM Cortex-M3, 48 MHz | ARM Cortex-M3, 48 MHz | ARM Cortex-M3, 48 MHz | ARM Cortex-M3, 48 MHz |
| FLASH Memory | 32KB | 32KB | 64KB | 256KB | 256KB |
| Connectivity | I2C, IrDA, SPI, UART/USART | I2C, IrDA, SPI, UART/USART | I2C, IrDA, SPI, UART/USART | I2C, IrDA, SPI, UART/USART | Adds USB device, I2C, SPI, UART/USART |
| Packaging / Delivery | Tape & Reel (T/R) | Tray | Tape & Reel | Tape & Reel | Tape & Reel |
| Relative Cost | Baseline (entry FLASH size) | Same die, tray (lower handling cost) | Slightly higher (2x FLASH) | Higher (8x FLASH) | Highest (256KB + USB) |
Key Differentiators
- Lowest-cost FLASH entry point of the 64-QFN SAM3N family (vs ATSAM3N4BA-MUR)
- Pin-to-pin migration to SAM3S for USB (vs ATSAM3S4BA-MUR)
- Tape & Reel for high-volume automation (vs ATSAM3N0BA-MU)
Design Notes
The ATSAM3N0BA-MUR operates from a 1.8V to 3.3V single supply. Place 100 nF ceramic decoupling capacitors at every VDD/VDDIO pin pair plus one bulk 4.7-10 uF capacitor near the regulator input, per standard Microchip SAM3N layout guidance. If VDDCORE is externally supplied, follow the datasheet's core-supply sequencing guidance - the SAM3N uses an internal regulator on some variants, so verify the specific SAM3N0B power tree in the official datasheet before routing power.
The 9x9 mm 64-QFN has a center exposed pad that should be soldered to a grounded copper pour with an array of thermal vias, both for heat dissipation and for a solid ground reference. Use the QFN's fine-pitch pad geometry consistent with standard 0.5 mm pitch QFN land patterns; verify exact pad dimensions against the Microchip drawing. Keep the SWD programming header routed to 4 test points (SWDIO, SWCLK, RESET, GND) for in-circuit flash programming via SAM-ICE/Atmel-ICE.
A frequent pitfall is firmware assuming more than 32KB FLASH - the ATSAM3N0BA is the entry memory point of the SAM3N family. If code size creeps past ~28KB, plan the migration to the pin-compatible ATSAM3N1BA/2BA/4BA early. Also confirm the exact revision of the SAM3N datasheet (FindIC references a 2018-01-23 publication) before finalizing ADC and timer peripheral configurations, as multiplexing tables differ between 64-pin and smaller packages.
Compliance Information
Mouser lists the ATSAM3N0BA-MUR as GREEN with MRL A moisture rating. Full RoHS/REACH certificates should be obtained from Microchip's official compliance portal.
